Client Connection to RAC Intermittently Fails-ORA-12545 TNS: Host or Object Does not Exist (Doc ID 364855.1)

Last updated on OCTOBER 31, 2016

Applies to:

Oracle Net Services - Version 10.2.0.5 to 12.1.0.2 [Release 10.2 to 12.1]
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.1.0.1 [Release 11.2 to 12.1]
Information in this document applies to any platform.
***Checked for relevance on 15-AUG-2016***


Symptoms

When attempting to connect to a RAC service name, the connection  intermittently  fails with an ORA-12545 error:  TNS: Host or object doesn't exist.   The expected behavior is that the connection would be redirected to any of the VIP listeners in the cluster.  This is normal under RAC Cluster node load balancing. 

However, when the server side listener endpoints are not correctly configured OR the client cannot resolve all forms of the VIP hostname, this connect-time issue can arise.

Changes

This is likely a new installation of RAC cluster.

Cause

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